A plot twist could be that Hotaru is secretly related to the main villain. This would put her in a difficult position as she has to choose between her loyalty to Utakata and her new - found family connection. It would also add a layer of complexity to her character.
One idea could be a fanfiction where Utakata and Hotaru have to team up to protect their village from a new and mysterious threat. They could discover new powers within themselves during this journey.
To find utakata x hotaru fanfiction, you could also join relevant fan groups or forums. For example, if there are Naruto - related fan groups (assuming utakata and hotaru are from Naruto), members might discuss and recommend good fanfictions about this pairing.
A possible plot twist is that the Kazekage has been secretly training in a new and powerful jutsu while in captivity. When the rescuers arrive, he is in the middle of a dangerous experiment with the jutsu, and they have to either help him complete it successfully to escape or stop him before it goes out of control.
I'm not really sure which specific Utakata and Hotaru lemon fanfictions are popular as I don't actively follow such content. But you can try searching on some popular fanfiction websites like Archive of Our Own or FanFiction.net. They usually have a wide range of fan - made stories.
One interesting plot twist could be that Naruto has hidden powers that are only awakened when he discovers his true heritage as Kaguya's son. These powers could be something completely different from what he already has, like the ability to control space - time in a unique way.
One common theme could be love and friendship. Since they are two characters, the fanfiction might explore how their relationship develops in terms of these emotions.
One interesting plot twist could be that Naruto discovers he has a long - lost older sibling who was thought to be dead. This sibling could be a powerful ninja with a different view on the Hidden Leaf Village, causing Naruto to question his own beliefs. Another twist could be that the Nine - Tailed Fox has a secret ability that no one knew about, which Naruto has to master in order to defeat a new, extremely powerful enemy.
One idea could be that Naruto and Hotaru are on a joint mission to rescue a group of kidnapped villagers. During the mission, they discover a hidden power within Hotaru that she didn't know she had, and Naruto helps her to master it. Another could be a story where Hotaru is wrongly accused of a crime, and Naruto believes in her innocence and sets out to prove it. They face many challenges together along the way.
Maybe Naruto discovers that some of his friends are actually NPCs (non - player characters) but they have developed real emotions. This would create a huge moral dilemma for Naruto. Does he treat them as real friends or just part of the game? It would also add a lot of depth to the story.
To write a good Utakata and Hotaru lemon fanfiction, start with a solid foundation of the characters. Utakata is likely to have certain quirks and Hotaru her own. Build a story around their relationship. Maybe start with a conflict that they need to overcome. When writing the more adult - themed parts, use euphemisms and don't be too explicit. Also, make sure your grammar and spelling are correct. Use vivid descriptions to bring the story to life, like describing the settings where their interactions take place.